FLIGHT-TEST INVESTIGATION OF A MODEL OF AN AERIAL VEHICLE SUPPORTED BY FOUR UNSHROUDED PROPELLERS
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON DC
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A dynamic stability and control investigation showed that the uncontrolled hovering motions of the model were unstable oscillations in pitch and roll. However, inasmuch as the periods of the oscillations were relatively long, the model could be controlled fairly easily in hovering without artificial stabilization. The basic model was difficult to control at the higher forward speeds of the investigation but easy to fly when horizontal and vertical tails were added.